Rotational exercise device

ABSTRACT

A rotational-exercise-device (device) is disclosed. In some exemplary embodiments, the device may comprise: a handle-member and a rotational-member. The handle-member may be an elongate member. The handle-member may further comprise a first-handle-member and a second-handle-member. The first-handle-member may removably attach to the second-handle-member. The handle-member may include a longitudinal-axis which runs down a center-longitude of the handle-member. The rotational-member may be a substantially ovoid shape. The rotational-member may comprise a hollow cylindrical cavity passing through a longitude-center of the rotational-member. A portion of the handle-member may pass removably through the longitude-center of the rotational-member. The rotational-member may be configured to rotate about this portion. When assembled and in use, a user may grip each handle-member (or portion thereof) and perform various exercises by placing some of the user&#39;s weight upon the rotational-member, while the user causes the rotational-member to rotate against some surface, such as a floor and/or wall.

PRIORITY NOTICE

The present application claims priority under 35 U.S.C. §119(e) to U.S. Provisional Patent Application Ser. No. 62/031,117 filed on Jul. 30, 2014, the disclosure of which is in-corporated herein by reference in its entirety.

TECHNICAL FIELD OF THE INVENTION

The present invention relates in general to abdominal exercise devices and more specifically to a rotational exercise device that may be suitable for abdominal exercises, pushups, triceps extensions, bicep curls, and a multitude of other exercises.

COPYRIGHT AND TRADEMARK NOTICE

A portion of the disclosure of this patent application may contain material that is subject to copyright protection. The owner has no objection to the facsimile reproduction by anyone of the patent document or the patent disclosure, as it appears in the Patent and Trademark Office patent file or records, but otherwise reserves all copyrights whatsoever.

Certain marks referenced herein may be common law or registered trademarks of third parties affiliated or unaffiliated with the applicant or the assignee. Use of these marks is by way of example and should not be construed as descriptive or to limit the scope of this invention to material associated only with such marks.

BACKGROUND OF THE INVENTION

It is well known that it is desirable for a person to exercise the various muscles in the abdominal region by performing repeated exercises against some form of resistance, for example for the purposes of burning calories, toning those muscles, increasing back strength, or for improving bowel movements. For many exercise enthusiasts, regardless of age, gender, or experience, the proverbial “six pack” is the ultimate end goal of exercising a person's abdominal region, where a six pack is a region of abdominal muscles below the enthusiast's diaphragm visibly showing at least six well defined abdominal muscle regions on the enthusiast, in a two-by three matrix of muscle.

Traditionally, the abdominal region was exercised by a person performing sit-ups and/or crunches exercises. The problems of a person performing sit-ups and/or crunches without the assistance of any other device are well known in the related art and result in at least four problems. Sit-ups and crunches are traditionally performed on a floor with the person repeatedly transitioning from a supine to a reclined position, while on the floor. In this disclosure supine is synonymous with a person lying flat on a floor, with the person's back against the floor. And in this disclosure reclined refers to a position where the person's upper back is off the floor, but the buttocks are touching the floor.

The first problem associated with traditional sit-ups and crunches is the problem of even getting into a reclined or supine position on the floor. For many people the floor location and getting into such a supine or reclined position on the floor is problematic. For example, elderly people can have difficulty in getting into a reclined or supine position on the floor and then transitioning back again off the floor from such a position. While others would simply prefer to not exercise from the floor.

The second problem that traditional sit-ups and crunches create is a possibility of stress, strain, discomfort, and pain in the lower back region because the lower back region is not supported when doing traditional sit-ups and crunches.

A third problem that traditional sit-ups and crunches create is a possibility of stress, strain, discomfort, and pain in the neck because while the sit-ups or crunches are being performed gravity continually pulls upon the person's head which can cause stress, strain, discomfort, and pain in the neck region. In addition, headaches are also a common problem stemming from an unsupported head during sit-ups and/or crunches exercises.

And a fourth problem arises because as a person becomes more in-shape, i.e. in better physical condition, the person must perform increasingly more repetitions of sit-ups and/or crunches to properly exercise the now stronger abdominal muscles which becomes time consuming. This occurs because the resistance which generates the abdominal exercise in sit-ups and crunches is merely the weight of the person performing the exercise acting against gravity and thus the effectiveness of traditional sit-ups and crunches are limited by the person's own body weight, unless some artificial weights are added or some form of increased resistance beyond a person's own body weight is provided.

Some of the related art has attempted to address the problems with traditional sit-ups and crunches by developing “ab rollers,” or abdominal rollers or abdominal wheels. Such devices typically comprise a handle member which passes through a center axis of one or two wheels. One version of an ab roller may comprise four wheels, two in the front and two in the back, with the handle member passing between the front set of wheels and the back set of wheels. Ab rollers in general are good exercise devices for exercising abdominal and “core” muscles, as well as muscles in the shoulders, back, and arms. In general, the more wheels an ab roller comprises, the easier the ab roller may be to use and thus less of a work out may result.

However, current ab rollers suffer a problem in that they are not modular. It would be desirable if the handle member could be detached from itself, such that the wheel could be replaced with different weighted wheels, and/or with wheels with different outside diameters. This would permit the user to vary exercises. This would also permit different users with different strengths and skill sets to utilize one ab roller system.

Furthermore, it would be desirable if the wheel structure itself could be replaced with an ovoid shape, where different ovoid shapes may comprise different outside diameters, with different exterior curvatures and/or with different weights. Such ovoid shapes may facilitate varying the degree of difficulty in using such an ab roller system.

Additionally, it would be desirable if the ab roller could be used for other exercises, other than abdominal exercises, such as pushups, triceps extensions, and bicep curls—thus saving the user time from having to use a multitude of exercise devices.

There is a need in the art for a rotational-exercise-device that addresses the above outlined problems.

It is to these ends that the present invention has been developed.

BRIEF SUMMARY OF THE INVENTION

To minimize the limitations in the prior art, and to minimize other limitations that will be apparent upon reading and understanding the present specification, the present invention describes a rotational-exercise-device.

In some exemplary embodiments, the rotational-exercise-device may comprise: a handle-member and a rotational-member. The handle-member may be an elongate member. The handle-member may further comprise a first-handle-member and a second-handle-member. The first-handle-member may be removably attached to the second-handle-member. The handle-member may include a longitudinal-axis which runs down a center-longitude of the handle-member. The rotational-member may be a substantially ovoid shape. The rotational-member may comprise a hollow cylindrical cavity, that is a cylindrical-cavity, passing through a longitude-center of the rotational-member. The handle-member may pass removably through the longitude-center of the rotational-member. The rotational-member may be configured to rotate about the longitudinal-axis. When assembled and in use, a user may grip each handle-member and perform various exercises by placing some of the user's weight upon the rotational-member, while the user causes the rotational-member to rotate against some surface, such as a floor and/or wall.

In some exemplary embodiments, the rotational-member may comprise a plurality of rotational-members, wherein only one rotational-member may be used at a time with the handle-member. Each rotational-member selected from the plurality of rotational-member may comprise a characteristic weight and/or exterior surface curvature and/or a different exterior texture (e.g., varying in roughness versus smoothness). The user then may select different rotational-members to use with the handle-member to perform more difficult exercises.

It is an objective of the present invention to provide a rotational-exercise-device that may be used for performing various abdominal exercises, including ab roller type abdominal exercises against horizontal to vertical substrates and including various inclined substrates in between horizontal and vertical.

It is another objective of the present invention to provide a rotational-exercise-device that may be used for performing various pushup exercises.

It is another objective of the present invention to provide a rotational-exercise-device that may be used for performing various triceps extension exercises.

It is another objective of the present invention to provide a rotational-exercise-device that may be used for performing various bicep(s) curl exercises.

It is another objective of the present invention to provide a rotational-exercise-device that may be used for performing various shoulder press exercises.

It is another objective of the present invention to provide a rotational-exercise-device that may be used for performing various front shoulder raise exercises.

It is another objective of the present invention to provide a rotational-exercise-device that may be used for performing various chest press exercises.

It is another objective of the present invention to provide a rotational-exercise-device that may be used for performing various weighted ab crunch exercises.

It is another objective of the present invention to provide a rotational-exercise-device that may be used for performing various medicine ball like crunch exercises.

It is another objective of the present invention to provide a rotational-exercise-device that may be used for performing various weighted squat and lunge exercises.

It is another objective of the present invention to provide a rotational-exercise-device that may comprise a rotational-member and a handle-member, wherein the rotational-member may rotate around (about) a longitude of the handle-member.

It is another objective of the present invention to provide a rotational-exercise-device that may comprise a rotational-member and a handle-member, wherein the rotational-member may not translate along a longitude of the handle-member (i.e. no rotational-member translation along a longitudinal-axis of the handle-member).

It is another objective of the present invention to provide a rotational-exercise-device that may comprise a rotational-member and a handle-member, wherein the handle-member may be comfortably gripped by the user.

It is another objective of the present invention to provide a rotational-exercise-device that may comprise a rotational-member, wherein the rotational-member may comprise a plurality of rotational-members, wherein only one rotational-member may be used at a time with the handle-member. Each rotational-member selected from the plurality of rotational-member may comprise a characteristic weight and/or exterior surface curvature. The user then may select different rotational-members to use with the handle-member to perform more difficult exercises.

It is another objective of the present invention to provide a rotational-exercise-device that may comprise a handle-member, wherein the handle-member may comprise a first-handle-member and a second-handle-member, wherein the first-handle-member and the second-handle-member may be removably attached to each other via a threading system.

It is yet another objective of the present invention to provide a rotational-exercise-device that may comprise a handle-member, wherein the handle-member may comprise a firsthandle-member and a second-handle-member, wherein the first-handle-member and the second-handle-member may be removably attached to each other via a quick release means.

These and other advantages and features of the present invention are described herein with specificity so as to make the present invention understandable to one of ordinary skill in the art, both with respect to how to practice the present invention and how to make the present invention.

BRIEF DESCRIPTION OF THE SEVERAL VIEWS OF THE DRAWINGS

Elements in the figures have not necessarily been drawn to scale in order to enhance their clarity and improve understanding of these various elements and embodiments of the invention. Furthermore, elements that are known to be common and well understood to those in the industry are not depicted in order to provide a clear view of the various embodiments of the invention.

FIG. 1A may depict an exemplary embodiment of a rotational-exercise-device, shown fully assembled and from a perspective view.

FIG. 1B may depict the exemplary embodiment of FIG. 1A, shown from an exploded perspective view.

FIG. 1C may depict the exemplary embodiment of FIG. 1A, shown from an exploded longitudinal side view.

FIG. 2A may depict an exemplary embodiment of a pair of handle-members, a first-handle-member and a second-handle-member, shown from an exploded view perspective view.

FIG. 2B may depict an exemplary embodiment of a first-handle-member, from a perspective view.

FIG. 2C may depict the exemplary embodiment of FIG. 2B, shown from a longitudinal side view.

FIG. 2D may depict the exemplary embodiment of FIG. 2B, shown from an end view, depicting a first-terminal-end.

FIG. 2E may depict the exemplary embodiment of FIG. 2B, shown from an end view, depicting a second-terminal-end.

FIG. 2F may depict an exemplary embodiment of a second-handle-member, from a perspective view.

FIG. 2G may depict the exemplary embodiment of FIG. 2F, shown from a longitudinal side view.

FIG. 2H may depict the exemplary embodiment of FIG. 2F, shown from an end view, depicting a third-terminal-end.

FIG. 2I may depict the exemplary embodiment of FIG. 2F, shown from an end view, depicting a fourth-terminal-end.

FIG. 3A may depict an exemplary embodiment of a rotational-member, shown from a perspective view.

FIG. 3B may depict the exemplary embodiment of FIG. 3A, shown from a longitudinal side view.

FIG. 3C may depict the exemplary embodiment of FIG. 3A, shown from a transverse width end view.

FIG. 3D may depict a cross-section of figure FIG. 3B, showing a rotational-member-volume of the rotational-member.

FIG. 3E may depict several different rotational-members, with different main-outside-diameters, but a same cavity-segment, shown from a longitudinal side view.

FIG. 4A may depict an exemplary embodiment of a quick-release-attachment-means for the pair of handle-members, shown from a perspective view.

FIG. 4B may depict the exemplary embodiment of FIG. 4A, shown from a longitudinal side view.

FIG. 4C may depict a cutaway of the exemplary embodiment of FIG. 4A showing an internal mechanism for the quick-release-attachment-means, shown from a longitudinal side view.

REFERENCE NUMERAL LISTING ORGANIZED BY ASCENDING ORDER

-   100 rotational-exercise-device 100 -   200 handle-member 200 -   201 longitudinal-axis 201 -   202 outside-diameter 202 -   203 first-handle-member 203 -   204 second-handle-member 204 -   205 longitudinal-segment 205 -   206 first-terminal-end 206 -   207 second-terminal end 207 -   208 first-gripping-portion 208 -   209 third-terminal-end 209 -   210 fourth-terminal end 210 -   211 second-gripping-portion 211 -   213 threading 213 -   214 proximal-distance 214 -   215 complimentary-threading 215 -   216 first-means-for-preventing-translation 216 (e.g., first-flange     216) -   217 first-proximal-distance 217 -   218 second-means-for-preventing-translation 218 (e.g., second-flange     218) -   219 second-proximal-distance 219 -   220 flange-separation-distance 220 -   300 rotational-member 300 -   301 cylindrical-cavity 301 -   302 a pair of openings 302 (e.g., opening 302) -   303 inside-diameter 303 -   304 cavity-segment 304 -   305 main-outside-diameter 305 -   306 exterior-surface 306 -   307 cavity-surface 307 -   308 rotational-member-volume 308 -   400 quick-release-attachment-means 400 -   413 one or more ball-bearings 413 -   430 push-button 430 -   432 push-shaft 432 -   434 region of shaft-diameter-narrowing 434 -   436 internal spring 436

DETAILED DESCRIPTION OF THE INVENTION

A rotational-exercise-device is described and disclosed. In some exemplary embodiments, the rotational-exercise-device may comprise: a handle-member and a rotational-member. The handle-member may be an elongate member. The handle-member may further comprise a first-handle-member and a second-handle-member. The first-handle-member may be removably attached to the second-handle-member. The handle-member may include a longitudinal-axis which runs down a center-longitude of the handle-member. The rotational-member may be a substantially ovoid shape. The rotational-member may comprise a hollow cylindrical cavity, that is a cylindrical-cavity, passing through a longitude-center of the rotational-member. The handle-member may pass removably through the longitude-center of the rotational-member. The rotational-member may be configured to rotate about the longitudinal-axis and about the handle-member. When assembled and in use, a user may grip each handle-member (or a portion thereof) and perform various exercises by placing some of the user's weight upon the rotational-member, while the user causes the rotational-member to rotate against some surface, such as a floor and/or wall.

In some exemplary embodiments, the rotational-member may comprise a plurality of rotational-members, wherein only one rotational-member may be used at a time with the handle-member. Each rotational-member selected from the plurality of rotational-member may comprise a characteristic weight and/or exterior surface curvature. The user then may select different rotational-members to use with the handle-member to perform more difficult exercises.

The rotational-exercise-device may be used by the user for various abdominal roller (abdominal wheel) exercises, wherein the rotational-member may be in contact with a substrate, either horizontal (e.g., floors and/or ground), vertical (e.g., walls), or various surfaces at some angle between horizontal and vertical. The rotational-exercise-device design and plastic and/or elastomeric exterior-surface of various interchangeable rotational-members may be used against a wall or other vertical surface (and/or inclined surfaces) as a guide that may help beginners as well as aid people in physical therapy.

The rotational-exercise-device may also be used for pushups, triceps extensions, bicep curls, shoulder presses, front shoulder raises, chest presses, weighted ab crunches, medicine ball like crunches, weighted squats, and the like.

With respect to pushups, the handle-member may be wider than comparable handles in currently existing abdominal rollers (abdominal wheels) and thus provide comfortable shoulder width positioning of the user's hands. The rotational-member may improve muscle proprioception due to instability during the exercise.

With respect to triceps extensions, the width (overall length) of the assembled rotational-exercise-device and the variable weights (of the rotational-members) may be similar to a weighted barbell, allowing the user to perform triceps extensions with excellent technique.

With respect to bicep curls, the width (overall length) of the assembled rotational-exercise-device and the variable weights (of the rotational-members) may be similar to a weighted barbell, allowing the user to perform bicep curls with excellent technique.

With respect to shoulder presses, the width (overall length) of the assembled rotational-exercise-device and the variable weights (of the rotational-members) may be similar to a weighted barbell, allowing the user to perform shoulder presses with excellent technique.

With respect to front shoulder raises, the width (overall length) of the assembled rotational-exercise-device and the variable weights (of the rotational-members) may be similar to a weighted barbell, allowing the user to perform front shoulder raises with excellent technique.

With respect to chest presses, the width (overall length) of the assembled rotational-exercise-device and the variable weights (of the rotational-members) may be similar to a weighted barbell, allowing the user to perform chest presses with excellent technique.

With respect to weighted ab crunches, the width (overall length) of the assembled rotational-exercise-device and the variable weights (of the rotational-member) may allow the user to hold the device behind the user's head while performing abdominal crunches, which may increase the difficulty of the abdominal crunch. Additionally, the assembled rotational-exercise-device may offer support to the user's head and neck while performing such weighted ab crunches.

With respect to crunches, the rotational-member may be used similar to a medicine ball for pummeling the abdominal region while the user performs crunches.

With respect to weighted squats and lunges, the width (overall length) of the assembled rotational-exercise-device and the variable weights (of the rotational-members) may be similar to a weighted barbell, allowing the user to perform weighted squats and lunges with excellent technique.

The rotational-exercise-device may be used assembled or the various rotational-members may be used individually without the handle-members, like hand weights. The rotational-exercise-device may allow the user to perform super setting (where one muscle group can be exhausted through multiple consecutive exercises to that body part). The rotational-exercise-device may allow the user to perform anaerobic and/or aerobic exercise routines as well.

In the following discussion that addresses a number of embodiments and applications of the present invention, reference is made to the accompanying drawings that form a part thereof, where depictions are made, by way of illustration, of specific embodiments in which the invention may be practiced. It is to be understood that other embodiments may be utilized and changes may be made without departing from the scope of the invention.

FIG. 1A may depict an exemplary embodiment of a rotational-exercise-device 100, shown fully assembled and from a perspective view. FIG. 1B may depict the exemplary embodiment of FIG. 1A, shown from an exploded perspective view. FIG. 1C may depict the exemplary embodiment of FIG. 1A, shown from an exploded longitudinal side view.

In some exemplary embodiments, rotational-exercise-device 100 may comprise: a handle-member 200 and a rotational-member 300. Handle-member 200 and rotational-member 300 may be in communication with each other. Handle-member 200 and rotational-member 300 may be in a desired conformation with respect to each other. Handle-member 200 may be an elongate member. Handle-member 200 may include a longitudinal-axis 201 which may run down a center and longitude of handle-member 200. See e.g., FIG. 1A. Handle-member 200 may include an outside-diameter 202 (see e.g., FIG. 2D). In some embodiments, handle-member 200 may provide at least two functions: (1) providing structural regions for a user to grip and interact with handle-member 200 and/or with rotational-exercise-device 100; and/or (2) providing structural regions for a given rotational-member 300 to rotate about. Continuing discussing the FIG. 1 series of figures, in some operational embodiments, handle-member 200 may pass removably through a longitude and a center of rotational-member 300. See e.g., FIG. 1A and FIG. 1B. In some embodiments, rotational-member 300 may be configured to rotate about longitudinal-axis 201. In some embodiments, rotational-member 300 may be configured to rotate about outside-diameter 202 and about longitudinal-axis 201. Further details of handle-member 200 may be discussed below under the FIG. 2 series discussion. Further details of rotational-member 300 may be discussed below under the FIG. 3 series discussion.

FIG. 2A may depicts an exemplary embodiment of a pair of handle-members 200, a first-handle-member 203 and a second-handle-member 204, shown from an exploded view perspective view. In the FIG. 2 series figures, rotational-member 300 may have been removed to better illustrate first-handle-member 203 and second-handle-member 204.

In some exemplary embodiments, handle-member 200 may comprise: first-handle-member 203 and second-handle-member 204. Each handle-member, e.g. first-handle-member 203 and second-handle-member 204, may an elongate member, e.g. a cylindrical elongate member. First-handle-member 203 and second-handle-member 204 may each include a longitudinal-segment 205. See e.g., FIG. 2C and FIG. 2G. In some embodiments, longitudinal-segment 205 in each first-handle-member 203 and second-handle-member 204 may be substantially similar to each other with respect to a length of longitudinal-segment 205. In some exemplary embodiments, longitudinal-segment 205 may be approximately 16 inches. In some exemplary embodiments, longitudinal-segment 205 may be substantially 16 inches. In some exemplary embodiments, longitudinal-segment 205 may be substantially 6 inches to and including 20 inches. In other embodiments, longitudinal-segment 205 may be more or less than 16 inches. A maximum length and a minimum length of longitudinal-segment 205 must exist because if too small, rotational-member 300 may not be able to rotate about the longitudinal-axis 201; and if too long, abdominal-exercise-device 100 would become too cumbersome to use for exercise purposes. First-handle-member 203 may be removably attached to second-handle-member 204.

FIG. 2A through FIG. 2E may focus on details of first-handle-member 203. FIG. 2F through FIG. 2I may focus on details of second-handle-member 204.

FIG. 2B may depict an exemplary embodiment of first-handle-member 203, from a perspective view. FIG. 2C may depicts the exemplary embodiment of FIG. 2B, shown from a longitudinal side view. FIG. 2D may depict the exemplary embodiment of FIG. 2B, shown from an end view, depicting a first-terminal-end 206. FIG. 2E may depict the exemplary embodiment of FIG. 2B, shown from an end view, depicting a second-terminal-end 207. FIG. 2D and FIG. 2E may depict oppositely opposing views of first-handle-member 203.

FIG. 2F may depict an exemplary embodiment of second-handle-member 204, from a perspective view. FIG. 2G may depict the exemplary embodiment of FIG. 2F, shown from a longitudinal side view. FIG. 2H may depict the exemplary embodiment of FIG. 2F, shown from an end view, depicting a third-terminal-end 209. FIG. 21 may depict the exemplary embodiment of FIG. 2F, shown from an end view, depicting a fourth-terminal-end 210. FIG. 2H and FIG. 21 may depict oppositely opposing views of second-handle-member 204.

In some embodiments, first-handle-member 203 may comprise: first-terminal-end 206, second-terminal end 207, and a first-gripping-portion 208. See e.g., FIG. 2A, FIG. 2B, and FIG. 2C. In some embodiments, first-terminal-end 206 may be disposed opposite of second-terminal-end 207. In some embodiments, first-terminal-end 206 may be separated from second-terminal-end 207 by longitudinal-segment 205. See e.g., FIG. 2C. First-gripping-portion 208 may be disposed between the first-terminal-end 206 and second-terminal-end 207. The user may removably grip first-gripping-portion 208 with a hand of the user.

In some embodiments, second-handle-member 204 may comprise: third-terminal-end 209, fourth-terminal-end 210, and a second-gripping-portion 211. See e.g., FIG. 2A, FIG. 2F, and FIG. 2G. In some embodiments, third-terminal-end 209 may be disposed opposite of fourth-terminal-end 210. In some embodiments, third-terminal-end 209 may be separated from fourth-terminal-end 210 by longitudinal-segment 205. For example, see FIG. 2G. Second-gripping-portion 211 may be disposed between third-terminal-end 209 and fourth-terminal-end 210. The user may removably grip second-gripping-portion 211 with the user's other hand, i.e. the hand not gripping first-gripping-portion 208.

In some embodiments, first-gripping-portion 208 and second-gripping-portion 211 may be configured to be regions of first-handle-member 203 and second-handle-member 204, respectively, that may be comfortable for the user to firmly grip with the user's hands. First-gripping-portion 208 and second-gripping-portion 211 may substantially circumscribe (e.g. cover) an outside-diameter 202 (e.g. an exterior surface) of handle-member 200. In some embodiments, outside-diameter 202 may be approximately 1 inch. In some embodiments, outside-diameter 202 may be substantially 1 inch. In some embodiments, outside-diameter 202 may be substantially 0.5 (½) inch to and including 1.5 (1½) inches. In some embodiments, outside-diameter 202 may be more or less than 1 inch.

In some embodiments, first-gripping-portion 208 and second-gripping-portion 211 may be substantially constructed of one or more thermoformed plastics, such as plastics formed by injection molding and plastics suitable for forming by injection molding.

In some embodiments, first-gripping-portion 208 and second-gripping-portion 211 may be substantially constructed of one or more semi-rigid and compressible foams. Foam density may be varied in different foam formulations to control for desired level of compressibility and semi-rigidity.

In some embodiments, first-gripping-portion 208 and second-gripping-portion 211 may be substantially constructed of one or more materials selected from the group comprising acrylonitrile-butadiene styrene (ABS), polyvinyl chloride (PVC), polyethylene (PE, HDPE), polypropylene, acrylic, nylon, polycarbonate, polyurethane, ethylene vinyl acetate (EVA), rubber, silicone, and the like. For plastic formulations, durometer may be varied to control for desired compressibility.

In some exemplary embodiments, second-terminal-end 207 may be removably attached to fourth-terminal-end 210 by an attachment-means. In some embodiments, the attachment-means may comprise: threading 213 and complimentary-threading 215. See e.g. FIG. 2A which may depict both threading 213 and complimentary-threading 215. In some embodiments, threading 213 may be an integral region of first-handle-member 203. In some embodiments, threading 213 on first-handle-member 203 may begin at second-terminal-end 207 and may run from second-terminal-end 207 to a proximal-distance 214 away from second-terminal-end 207. See e.g., FIG. 2C. In some embodiments, complimentary-threading 215 may be an integral region of second-handle-member 204. In some embodiments, complimentary-threading 215 on second-handle-member 204 may begin at fourth-terminal-end 210 and may run from fourth-terminal-end 210 the proximal-distance 214 away from fourth-terminal-end 210. In some embodiments, complimentary-threading 215 on second-handle-member 204 may begin at fourth-terminal-end 210 and may run from fourth-terminal-end 210 more than the proximal-distance 214 away from fourth-terminal-end 210. In some embodiments, the more than the proximal-distance 214 may be 0.03125 ( 1/32) inch to and including 0.25 (¼) inch more than proximal-distance 214. See e.g., FIG. 2F; however, proximal-distance 214 may not be depicted in FIG. 2F because complimentary-threading 215 may be inside threading that protrudes into second-handle-member 204. In some embodiments, threading 213 of second-terminal-end 207 may be removably screwed to complimentary-threading 215 of fourth-terminal-end 210.

In some embodiments, threading 213 may be integral with second-handle-member 204 and complimentary-threading 215 may be integral with first-handle-member 203. This configuration is not depicted in the figures.

In some exemplary embodiments, each proximal-distance 214 (i.e. of each handle-member) may be approximately 3 inches. In some exemplary embodiments, each proximal-distance 214 may be substantially 3 inches. In some embodiments, proximal-distance 214 of first-handle-member 203 may be substantially 3 inches, and proximal-distance 214 of second-handle-member 204 may be more than 3 inches, but less than 4 inches. In some exemplary embodiments where each proximal-distance 214 may be substantially 3 inches and where each handle-member (e.g., 203 and 204) may be substantially 16 inches in length, then a total length of assembled rotational-exercise-device 100 may be substantially 29 inches (i.e. 32 inches minus the 3 inches of overlap used for the attachment-means). In other embodiments, proximal-distance 214 may be more or less than 3 inches.

In some exemplary embodiments, each proximal-distance 214 (i.e. of each handle-member) may be approximately 1 inch. In some exemplary embodiments, each proximal-distance 214 may be substantially 1 inch. In some embodiments, proximal-distance 214 of first-handle-member 203 may be substantially 1 inch, and proximal-distance 214 of second-handle-member 204 may be more than 1 inch, but less than 2 inches. In some exemplary embodiments where each proximal-distance 214 may be substantially 1 inch and where each handle-member (e.g., 203 and 204) may be substantially 15 inches in length, then a total length of assembled rotational-exercise-device 100 may be substantially 29 inches (i.e. 30 inches minus the 1 inch of overlap used for the attachment-means). In other embodiments, proximal-distance 214 may be more or less than 1 inch.

Note, a maximum of proximal-distance 214 may be determined by a length of each handle-member (e.g., 203 and 204) and by a need for each handle-member to have a gripping portion (e.g., 208 and 211) that may be sized to accommodate the user's hand. In some embodiments, proximal-distance 214 may be at most substantially 4 inches. A minimum of proximal-distance 214 may be determined a minimal safe length of threading necessary to support a weight of the user exercising with rotational-exercise-device 100, which may also be function of materials of construction for each handle-member (e.g., 203 and 204). In some embodiments, proximal-distance 214 may be at least substantially 0.25 (¼) inch. Note, in some embodiments, the length of each or of either handle member (e.g., 203 and 204) may be longitudinal-segment 205.

In other embodiments, the attachment-means may be a removable attachment means other than threading systems shown in the FIG. 2 series of figures. For example, and without limiting the scope of the present invention, a quick release removable attachment means may be discussed below in the FIG. 4 series discussion.

In some embodiments, first-handle-member 203 may comprise a first-means-for-preventing-translation 216. See e.g., FIG. 2C. First-means-for-preventing-translation 216 may be located within a first-proximal-distance 217 of first-terminal-end 206. See e.g., FIG. 2C. First-means-for-preventing-translation 216 may be configured to prevent translation of rotational-member 300 along first-handle-member 203 in a direction of longitudinal-axis 201. For example, and without limiting the scope of the present invention, first-means-for-preventing-translation 216 may be a first-flange 216. See e.g., FIG. 2C. An outside-diameter of first-flange 216 may be larger than an opening 302 of rotational-member 300 (see FIG. 3A for opening 302).

In some embodiments, second-handle-member 204 may comprise a second-means-for-preventing-translation 218. See e.g., FIG. 2G. Second-means-for-preventing-translation 218 may be located within a second-proximal-distance 219 of third-terminal-end 209. See e.g., FIG. 2G. Second-means-for-preventing-translation 218 may be configured to prevent translation of rotational-member 300 along second-handle-member 204 in a direction of longitudinal-axis 201. For example, and without limiting the scope of the present invention, second-means-for-preventing-translation 218 may be a second-flange 218. An outside-diameter of the second-flange 218 may be larger than an opening 302 of rotational-member 300 (see FIG. 3A for opening 302).

In some embodiments, second-proximal-distance 219 may be a greater length than first-proximal-distance 217. In some embodiments, first-proximal-distance 217 may be a greater length than second-proximal-distance 219.

In some embodiments, when first-handle-member 203 may be removably attached to second-handle-member 204, handle-member 200 may include a flange-separation-distance 220. See e.g., FIG. 1A. In some embodiments, flange-separation-distance 220 may be a distance from first-means-for-preventing-translation 216 to second-means-for-preventing-translation 218. In some embodiments, flange-separation-distance 220 may be substantially similar to a length of a cavity-segment 304 of rotational-member 300 (see FIG. 3B for cavity-segment 304). In some embodiments, flange-separation-distance 220 may be greater than the length of cavity-segment 304 of rotational-member 300 (see FIG. 3B for cavity-segment 304).

In some exemplary embodiments, handle-member 200 may be substantially rigid. In some exemplary embodiments, handle-member 200 may be substantially constructed of one or more metals selected from the group comprising steel, stainless steel, aluminum, brass, and the like. In some exemplary embodiments, handle-member 200 may be substantially constructed of one or more of a plastic, a glass filled plastic, or carbon fiber. In some embodiments, all or a region of an exterior-surface of handle-member 200 may be coated with a paint, polymer coating, powder coating, and the like. For example, and without limiting the scope of the present invention, all or a region of an exterior-surface of handle-member 200 may be coated with a vinyl dip.

FIG. 3A may depict an exemplary embodiment of rotational-member 300, shown from a perspective view. FIG. 3B may depict the exemplary embodiment of FIG. 3A, shown from a longitudinal side view. FIG. 3C may depict the exemplary embodiment of FIG. 3A, shown from a transverse width end view. FIG. 3D may depict a cross-section of figure FIG. 3B (e.g., taken in parallel with main-outside-diameter 305 and at a greatest diameter of main-outside-diameter 305), showing a rotational-member-volume 308 of rotational-member 300.

In some embodiments, rotational-member 300 may be substantially ovoid in shape. See e.g., the FIG. 3 series of figures and the FIG. 1 series of figures. Rotational-member 300 may comprise an exterior-surface 306. See e.g., FIG. 3A. In some embodiments, exterior-surface 306 may comprise an ovoid shape (e.g. egg shaped). See e.g., FIG. 3A.

In some embodiments, the ovoid shape may comprise a substantially spherical shape (not depicted in the various figures). The more spherical exterior-surface 306 may be, the more difficult it may be for the user to exercise with rotational-exercise-device 100, which may be desirable for more advanced users who may desire more of core muscle work out.

In some embodiments, exterior-surface 306 may comprise a cylindrical shape. In some embodiments, the cylindrical shape may comprise a wheel shape or disk shape (not depicted in the various figures). The more wheel shape exterior-surface 306 may be, the more difficult it may be for the user to exercise with rotational-exercise-device 100, which may be desirable for more advanced users who may desire more of core muscle work out.

In some embodiments, rotational-member 300 may comprise: a cylindrical-cavity 301 (see e.g., FIG. 3A) and a main-outside-diameter 305 (see e.g., FIG. 3B). Cylindrical-cavity 301 may be configured to receive a portion of handle-member 200 within a cavity of cylindrical-cavity 301. Cylindrical-cavity 301 may be a hollow elongate member.

In some embodiments, cylindrical-cavity 301 may comprise: a pair of openings 302 (see e.g., FIG. 3A), an inside-diameter 303 (see e.g., FIG. 3C), and a cavity-segment 304 (FIG. 3B). In some embodiments, each of two openings 302 may be disposed opposite of each other, for example, in FIG. 3A only one of the two opening 302 may be depicted, but where the remaining non-depicted opening 302 may be symmetrical and/or equivalent with the shown opening 302. In some embodiments, each of two openings 302 may provide access to cylindrical-cavity 301 at either terminal end of cylindrical-cavity 301. Inside-diameter 303 may be a diameter of cylindrical-cavity 301, so that portions of handle-member (e.g., 203 and 204) may pass removably within cylindrical-cavity 301. Inside-diameter 303 may be greater than outside-diameter 202. Cavity-segment 304 may separate each opening 302 from the other opening 302. Cavity-segment 304 may be less than flange-separation-distance 220.

In some embodiments cavity-segment 304 may be 8 inches. In some embodiments cavity-segment 304 may be six inches. In some embodiments cavity-segment 304 may be 3 inches to and including 20 inches. In other embodiments, cavity-segment 304 may be different lengths.

In some embodiments, main-outside-diameter 305 (see e.g., FIG. 3B and FIG. 3C) may be perpendicular to cavity-segment 304. Main-outside-diameter 305 may be substantially perpendicular to longitudinal-axis 201 when portions of handle-member 200 may be communication with rotational-member 300 as shown in FIG. 1A. Main-outside-diameter 305 may be greater than inside-diameter 303.

In some embodiments, cylindrical-cavity 301 may comprise a cavity-surface 307 (see e.g., FIG. 3A). Cavity-surface 307 may be defined (bounded) by cavity-segment 304 and by inside-diameter 303. Exterior-surface 306 and cavity-surface 307 together may bound a rotational-member-volume 308 (see e.g., FIG. 3D).

In some embodiments, rotational-member 300 may be substantially constructed of steel and/or iron or some other similarly heavily weighted material, with an elastomeric covering for exterior-service 306, such as rubber or silicone or a plastic covering for exterior-service 306. In such embodiments, rotational-member-volume 308 (i.e. the interior of rotational-member 300) of rotational-member 300 may be solid or substantially solid.

In some embodiments, rotational-member 300 may be substantially constructed of one or more thermoformed plastics, such as plastics formed by injection molding and plastics suitable for forming by injection molding.

In some embodiments, rotational-member 300 may be substantially constructed of one or more semi-rigid and compressible foams. Foam density may be varied in different foam formulations to control for desired level of compressibility, semi-rigidity, and overall weight of a given rotational-member.

In some embodiments, rotational-member 300 may be substantially constructed of one or more materials selected from the group comprising ABS, PVC, PE, HDPE, polypropylene, acrylic, nylon, polycarbonate, polyurethane, EVA, rubber, silicone, and the like. For plastic formulations, durometer may be varied to control for desired compressibility.

In some embodiments, exterior-surface 306 and/or cavity-surface 307 may be substantially constructed of one or more of the materials selected from the group comprising ABS, PVC, PE, HDPE, polypropylene, acrylic, nylon, polycarbonate, polyurethane, EVA, rubber, silicone, and the like. In some embodiments, exterior-surface 306 may comprise different textures for different rotational-members 300. For example, and without limiting the scope of the present invention, such textures may vary in different smoothness, roughness, compressibility, and variances in texture symmetry, including asymmetrical textures, such these variations may aid in making exercising easier or more difficult as may be desired by a given user.

In some exemplary embodiments, rotational-exercise-device 100 may comprise: handle-member 200 (which may be two removable handle-members) and the rotational-member; wherein the rotational-member may be selected from a plurality of different-rotational-members, such as, but not limited to, 300, 300 a, 300 b, 300 c, and the like). That is, in such embodiments, rotational-exercise-device 100 may be a set, comprising one handle-member 200 (which may be two removable handle-members, e.g., 203 and 204) and the plurality of different-rotational-members (e.g. 300, 300 a, 300 b, 300 c, and the like); wherein only one such different-rotational-member (e.g. 300, 300 a, 300 b, 300 c, and the like) may be used at a time with handle-member 200 for exercises that may involve rotating the rotational-member about longitudinal-axis 201. See e.g., FIG. 3E. FIG. 3E may depict several different rotational-members 300, with different main-outside-diameters, but each with a same cavity-segment 304 (i.e. a same length of cavity-segment 304), shown from a longitudinal side view. In some exemplary embodiments, the rotational-member may comprise a plurality of different-rotational-members (e.g., 300, 300 a, 300 b, 300 c, and the like). In some exemplary embodiments, the rotational-member may be selected from the plurality of different-rotational-members (e.g., 300, 300 a, 300 b, 300 c, and the like). Each different-rotational-member selected from the plurality of different-rotational-members may comprise different-main-outside-diameters (e.g., 305, 305 a, 305 b, and 305 c, respectively). Each different-main-outside-diameter may comprise a different diameter. For example, in a set of rotational-exercise-device 100, comprising the plurality of different-rotational-members (e.g. 300, 300 a, 300 b, and 300 c), the different-mainoutside-diameters may be substantially: 5, 8, 12, and 15 inches. In some embodiments, the different-main-outside-diameters may be substantially 3 inches to and including 20 inches for any given different-rotational-member selected from the plurality of different-rotational-members. In other embodiments, other different-main-outside-diameters may be utilized. Each different-rotational-member selected from the plurality of different-rotational-members may comprise a different exterior curvature and/or a different exterior texture (e.g., varying in roughness versus smoothness). As the main-outside-diameter increases, the exterior curvature may also increase, which may provide for a more difficult work out. Each different-rotational-member selected from the plurality of different-rotational-members may comprise a different resistive weight. The user may interchange and use each different-rotational-member selected from the plurality of different-rotational-members one at a time, in order to exercise (work out) with different resistive weights and/or with different exterior curvatures, which may provide varying challenges for a same user and/or may render rotational-exercise-devices 100 usable by a greater number of different users.

In some embodiments, rotational-member-volume 308, including different rotational-member-volumes inherent with each different-rotational-member selected from the plurality of different-rotational-members, may be partially filled or completely filled with a filling-material. In some embodiments, the filling-material may be selected from one or more of the group comprising a liquid, sand, silica, steel, iron, gels, foams, and the like. Such filling-materials may provide resistive weight to the user when exercising with rotational-exercise-device 100.

FIG. 4A may depict an exemplary embodiment of a quick-release-attachment-means 400 for the pair of handle-members 200, shown from a perspective view. FIG. 4B may depict the exemplary embodiment of FIG. 4A, shown from a longitudinal side view. FIG. 4C may depict a cutaway of the exemplary embodiment of FIG. 4A showing an internal mechanism for quick-release-attachment-means 400, shown from a longitudinal side view. Or alternatively, FIG. 4C may depict a longitudinal cross-section of the exemplary embodiment of FIG. 4A showing the internal mechanism for quick-release-attachment-means 400.

In some embodiments, the attachment-means may comprise quick-release-attachment-means 400. Quick-release-attachment-means 400 may comprise retractable ball-bearings 413 located on an exterior of one handle-member, a means for retracting ball-bearings 413 and a receiving-locking-track (i.e. a channel) located on the other handle-member (the other handle is not shown in FIG. 4A, FIG. 4B, nor FIG. 4C). Ball-bearing 413 may comprise one or more such ball bearings. In some embodiments, there may be two, three, four, or five ball-bearings 413. For example, and without limiting the scope of the present invention, the means for retracting ball-bearing 413 may comprise a push-button 430, wherein push-button 430 may be integral and collinearly aligned with a push-shaft 432, wherein push-shaft 432 may comprise a region of shaft-diameter-narrowing 434 sized to accommodate one or more ball bearing 413, and an internal spring 436 coiled around a portion of push-shaft 432. See e.g., FIG. 4C. Such that when push-button 430 may depressed, compressing internal spring 436, one or more ball bearing 413 may slip into the region of shaft-diameter-narrowing 434 resulting in the one or more ball-bearing 413 being pulled within the exterior of the applicable handle-member, allowing the two handle-member to be removed from each other. For example, such an arrangement may be depicted in FIG. 4A, FIG. 4B, and FIG. 4C, wherein one or more ball-bearings 413 may be located near (e.g., within a 0.5 (½) inch) second-terminal-end 207 of first-handle-member 203 and push-button 430 may be located at first-terminal-end 206. In such an embodiment, the receiving-locking-track may be located on second-handle-member 204 (not depicted in the FIG. 4 series figures), within a cavity proximal to fourth-terminal end 210. In some embodiments, the receiving-locking-track may be for removably receiving portions of the one or more ball bearings 413 in a locked configuration (resting configuration when push-button 430 may not be pressed.) The fourth-terminal end 210 may be substantially perpendicular to the longitudinal-axis 201 of the handle-member.

In some embodiments, the handle-member of rotational-exercise-device 100 may be a single-handle-member, as opposed to first-handle-member 203 and second-handle-member 204. In such embodiments, the single-handle-member may comprise a single-means-for-preventing-translation, e.g. a single-flange. In such embodiments, the single-handle-member may be inserted into one opening 302 into cylindrical-cavity 301 until the single-means-for-preventing-translation prevents further insertion. In such embodiments, the single-handle-member may be prevented from translating back out of cylindrical-cavity 301 by a removable-anti-translation-means. The removable-anti-translation-means may removably engage a portion of the single-handle-member which may protrude out from the second opening 302.

For example, and without limiting the scope of the present invention, the removable-anti-translation-means may comprise a pin, wherein the pin may run through a hole in the sin-gle-handle-member, such that the pin runs perpendicular to the longitudinal-axis of the single-handle-member and wherein the pin may have a length greater than inside-diameter 303, such that the pin when inserted through the single-handle-member, while the single-handle-member may be inserted in cylindrical-cavity 301, the length of the pin prevents translation of the single-handle-member back out of cylindrical-cavity 301.

For example, and without limiting the scope of the present invention, the removable-anti-translation-means may comprise a removable-flange, wherein the removable-flange may be configured to removably circumscribe the outside-diameter of the single-handle-member, and wherein the removable-flange may have an outside-diameter greater than inside-diameter 303, such that the removable-flange when removably circumscribing the single-handle-member, while the single-handle-member may be inserted in cylindrical-cavity 301, the removable-flange may prevent translation of the single-handle-member back out of cylindrical-cavity 301.

Note with respect to the materials of construction disclosed and discussed above and herein, it is not desired nor intended to thereby unnecessarily limit the present invention by reason of such restricted disclosure.

Note, use of “approximate” and/or “approximately” when not expressly and explicitly defined, may refer to tolerances of plus or minus 20% with respect to the applicable dimension. Note, use of “substantially” when not expressly and explicitly defined, may refer to tolerances of plus or minus 5% with respect to the applicable dimension.

A rotational-exercise-device has been described. The foregoing description of the various exemplary embodiments of the invention has been presented for the purposes of illustration and disclosure. It is not intended to be exhaustive or to limit the invention to the precise form disclosed. Many modifications and variations are possible in light of the above teaching without departing from the spirit of the invention.

While the invention has been described in connection with what is presently considered to be the most practical and preferred embodiments, it is to be understood that the invention is not to be limited to the disclosed embodiments, but on the contrary, is intended to cover various modifications and equivalent arrangements included within the spirit and scope of the appended claims. 

What is claimed is:
 1. A rotational-exercise-device, comprising: a handle-member, wherein the handle-member includes a longitudinal-axis and an outside-diameter; and a rotational-member, wherein the rotational-member rotates about the longitudinal-axis, and wherein the rotational-member rotates about a portion of the handle-member; wherein the handle-member and the rotational-member are in communication with each other and are in a desired conformation with respect to each other.
 2. The rotational-exercise-device according to claim 1, wherein the handle-member is substantially constructed of one or more metals selected from the group consisting of steel, stainless steel, aluminum, and brass.
 3. The rotational-exercise-device according to claim 1, wherein the handle-member further comprises: a first-handle-member; a second-handle-member; wherein the first-handle-member and the second-handle-member each include a longitudinal-segment that is substantially similar to each other with respect to a length of the longitudinal-segment; and wherein the first-handle-member is removably attached to the second-handle-member.
 4. The rotational-exercise-device according to claim 3, wherein the first-handle-member comprises: a first-terminal-end and a second-terminal end, wherein the first-terminal-end is disposed opposite of the second-terminal-end, and wherein the first-terminal-end is separated from the second-terminal-end by the longitudinal-segment; a first-gripping-portion disposed between the first-terminal-end and the second-terminal-end; wherein a user removably grips the first-gripping-portion with a hand of the user.
 5. The rotational-exercise-device according to claim 4, wherein the second-handle-member comprises: a third-terminal-end and a fourth-terminal end, wherein the third-terminal-end is disposed opposite of the fourth-terminal-end, and wherein the third-terminal-end is separated from the fourth-terminal-end by the longitudinal-segment; a second-gripping-portion disposed between the third-terminal-end and the fourth-terminal-end; wherein the user removably grips the second-gripping-portion with the user's other hand.
 6. The rotational-exercise-device according to claim 5, wherein the first-gripping-portion and the second-gripping-portion are substantially constructed of one or more materials selected from the group consisting of acrylonitrile-butadiene styrene, polyvinyl chloride , polyethylene, polypropylene, acrylic, nylon, polycarbonate, polyurethane, ethylene vinyl acetate, rubber, and silicone; wherein the first-gripping-portion and the second-gripping-portion circumscribe outside-diameter.
 7. The rotational-exercise-device according to claim 5, wherein the second-terminal-end is removably attached to the fourth-terminal-end by an attachment-means.
 8. The rotational-exercise-device according to claim 7, wherein the attachment means comprises: threading on the first-handle-member beginning at the second-terminal-end and running from the second-terminal-end a proximal-distance away from the second-terminal-end; and complimentary-threading on the second-handle-member beginning at the fourth-terminal-end and running from the fourth-terminal-end at least the proximal-distance away from the fourth-terminal-end; wherein the threading of the second-terminal-end is removably screwed to the complimentary-threading of the fourth-terminal-end.
 9. The rotational-exercise-device according to claim 5, wherein the first-handle-member comprises a first-means-for-preventing-translation, wherein the first-means-for-preventing-translation is located within a first-proximal-distance of the first-terminal-end, and wherein the first-means-for-preventing-translation is configured to prevent translation of the rotational-member along the first-handle-member in a direction of the longitudinal-axis.
 10. The rotational-exercise-device according to claim 9, wherein the second-handle-member comprises a second-means-for-preventing-translation, wherein the second-means-for-preventing-translation is located within a second-proximal-distance of the third-terminal-end, and wherein the second-means-for-preventing-translation is configured to prevent translation of the rotational-member along the second-handle-member in a direction of the longitudinal-axis, and wherein the second-proximal-distance is less than the first-proximal-distance.
 11. The rotational-exercise-device according to claim 10, wherein when the first-handle-member is removably attached to the second-handle-member, the handle-member includes a flange-separation-distance, wherein the flange-separation-distance is a distance from the first-means-for-preventing-translation to the second-means-for-preventing-translation.
 12. The rotational-exercise-device according to claim 11, wherein the rotational-member is substantially ovoid in shape and wherein the rotational-member comprises: a cylindrical-cavity, configured to receive the portion of the handle-member, wherein the cylindrical-cavity comprises: a pair of openings, wherein each opening provides access to the cylindrical-cavity at either terminal end of the cylindrical-cavity; an inside-diameter, wherein the inside-diameter is greater than the outside-diameter of the handle-member; a cavity-segment, wherein the cavity-segment separates each opening from the other opening, wherein the cavity-segment is less than the flange-separation-distance; a main-outside-diameter, perpendicular to the cavity-segment and wherein the main-outside-diameter is substantially perpendicular to the longitudinal-axis, and wherein main-outside-diameter is greater than the inside-diameter.
 13. The rotational-exercise-device according to claim 12, wherein the rotational-member is selected from a plurality of different-rotational-members, wherein each different-rotational-member selected from the plurality of different-rotational-members comprises a different-main-outside-diameter, wherein each different-main-outside-diameter has a different diameter; wherein each different-rotational-member selected from the plurality of different-rotational-members includes a different resistive weight.
 14. The rotational-exercise-device according to claim 12, wherein the rotational-member is substantially constructed of one or more of the materials selected from the group consisting of acrylonitrile-butadiene styrene, polyvinyl chloride, polyethylene, polypropylene, acrylic, nylon, polycarbonate, polyurethane, ethylene vinyl acetate, rubber, and silicone.
 15. The rotational-exercise-device according to claim 12, wherein the rotational-member is substantially constructed of one or more thermoplastics suitable for injection molding.
 16. The rotational-exercise-device according to claim 12, wherein the rotational-member is substantially constructed of one or more of a steel material and/or an iron material.
 17. The rotational-exercise-device according to claim 12, wherein rotational-member further comprises an exterior-surface, and wherein the cylindrical-cavity further comprises a cavity-surface, wherein the cavity-surface is defined by the cavity-segment and by the inside-diameter, wherein the exterior-surface and the cavity-surface together bound a rotational-member-volume.
 18. The rotational-exercise-device according to claim 17, wherein the rotational-member-volume is partially filled or completely filled with a filling-material.
 19. The rotational-exercise-device according to claim 18, wherein the filling-material is selected from one or more of the group consisting of a liquid, sand, silica, steel, iron, gels, or foams; wherein the filling-material provides resistive weight to the user.
 20. The rotational-exercise-device according to claim 17, wherein the exterior-surface comprises an ovoid shape.
 21. The rotational-exercise-device according to claim 20, wherein the ovoid shape comprises a substantially spherical shape.
 22. The rotational-exercise-device according to claim 17, wherein the exterior-surface and the cavity-surface are substantially constructed of one or more of the materials selected from the group consisting of acrylonitrile-butadiene styrene, polyvinyl chloride, polyethylene, polypropylene, acrylic, nylon, polycarbonate, polyurethane, ethylene vinyl acetate, rubber, and silicone. 